Classification of stone grades, how to distinguish the diamond grades in diamond rings? The grades of diamonds that have been inlaid are generally divided into: clarity: from high to low, there are five grades: LC, VVS, VS, SI and P, and LC grade is generally rare. Color: from high to low, it is divided into five grades: extremely white, excellent white, white, light yellow white and light yellow white, with white and light yellow white as the main ones. Weight: the weight unit is ct, 1 carat = 0.2g = 100 minute, and the general diamond grade should be indicated above 100 minute. Cut-off value: Cut-off value is generally not used to evaluate diamond setting. The fluorescence of diamond has nothing to do with the quality of diamond, which is one of the evidences to ensure that the certificate corresponds to the diamond.

The classification of diamonds is mainly based on the "4C" international standard. Therefore, we should pay attention to the "4C" western proverb "A diamond is a girl's best friend", and China also has the saying "A diamond is eternal, and another is eternal". Although many people also choose other jewels as engagement rings, such as rubies, emeralds or pearls, diamond rings are the most fashionable choice at present. Pay attention to the "four Cs" when choosing diamonds: cut-cut, clarity-clarity, color-color, carat-carat.

Cutting: The cutting of diamonds is extremely important, which directly affects the value of diamonds. Only the standard cutting method can show its brilliant light and achieve the perfect combination of clarity and color. The cut diamond is usually spherical or conical. There are many shapes of cut surfaces, such as square, rectangle, hexagon, circle and ellipse, but the most popular one is the simple hexagon, and many of its cut surfaces can better show the light of diamonds.

Cleanliness-Cleanliness: Diamonds are crystallized from mantle magma deep in the earth, which has undergone geological changes for hundreds of millions of years and has various natural traces. The color, size and position distribution of these marks have different degrees of influence on the value of diamonds. There are often defects on the surface or inside of diamonds, such as bubbles, cracks, feathers and so on. The fewer flaws, the higher the grade of the diamond. Generally speaking, the clarity of diamonds is divided into five grades and ten grades.

Color-color: The color of diamonds ranges from precious colorless, rare light blue and pink to common light yellow. The more transparent and colorless the diamond is, the more white light can penetrate, and the more colorful it is after refraction and dispersion. The whitest diamond is grade D, and the others are grades E, F, G, H, I, J, K, L, M and N in turn.

Carat: The weight of diamonds is measured in carats. 1 carat equals 0.2 grams. One carat is divided into 100, such as 0.75, which is also called 75. Diamonds with the same weight will have different prices due to different colors, cleanliness and cutting. For example, a 2-carat diamond cannot be an ideal choice if it is cut elegantly, its shape is outdated, there are many bubbles and its clarity is low. A diamond weighing only 1/2 carats will be more attractive and more expensive if it is colorless, high in purity and adopts the most popular cutting.